html - Background Image not working in Ionic/Javascript/Angular -

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my background image not working ionic project in css. works if inline html sloppy. remember hearing base64 not sure. know problem be? thanks

put images want use within project in www/img folder , set style of in html file.

for example:

 <ion-content  style="background: url(img/image_name.jpg) center; background-size: cover;">

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